Drill extension



R. DEI- PORTO.

DRILL EXTENSION. APPLICATION FILED Nom-4,1919.

Pat-amie@ Apr. 2

INVENTOR j Fig. 7.. L

UNITED STAIRS RINALIDO DEL PORTO, OF VALLEJO, CALIFORNIA.

DRILL EXTENSION.

Specification of Letter/s Patent.

r`Patented Apr. 26,1921.

Application led November 4, 1919. Serial No. 335,694.

T 0 all whom t may concern:

Be it known that I, RINALDO DEL Pon'ro, a subject of the King of Italy, residing at Vallejo, in the county of Solano and State of California, have invented new and useful Improvements in Drill Extensions, of which the following is a specification.

This invention relates to a drill extension and especially to an extension of the telesco )ing type.

ne of the objects of the present invention is to provide a simple, substantial and easily operated telescopic extension adapted for communicating rotary motion from a driven part or motor, engageable with one end of the extension, to a drill or other suitable tool attached to the opposite end of the extension.

Another obj ect of the invention is to provide means for adjustably connecting the telescoping sections of the extension in such a manner that the distance between the driving motor and the drill may be varied to a considerable extent. Another object of the invention is to provide a structure which permits the telescoping sections to be. extendedv or retracted without breaking or otherwise interfering with the driving connection formed between the same. Another object of the invention is to provide means whereby the rotary movement of the rotor or other driving member employed may be transmitted to extend or retract the telescoping members supporting the drill. Further objects will hereinafter appear.

The invention consists of the parts and the construction, combination and arrange ment of parts as hereinafter more fully .described and claimed, having reference to the accompanying drawings, in which- Figure 1 is an exterior view of the drill extension. j

Fig. 2 is a central, vertical section, partly in elevation and partly broken away.

Fig. 3 is a central, vertical section.

Fig. 4 is an enlarged cross section on line 4-4ofFig.2. A f

Fig. 5 is an'enlarged detail section, showin the driving connection between the driving tube and the screwrod.

Fig. Y6 `is a cross section on line 6-6 of Fig. 5. i

Fig. 7 is an enlarged detail section of the lower end of the screw rod. i

Fig. 8 is a cross section on line 8--8 of Referring to the drawings in detail, A indicates a tapered shank of suitable construction, which is adapted to be inserted in a chuck carried by a motor or other suitable -driving member. Secured to the head of the shank, as shown at 2, is an inner driving tube 3 and an exterior covering tube 1. Formed on the lower end of the driving tube is an annular recess 5 and extending approximately from end to end of the driving tube are a pair of oppositely positioned slots 6. Rotatably mounted on the lower end of the driving tube is a nut Z which is attached to the driving tube by means of a sleeve-like extension 8 and a snap ring 9. The upper end ofthe sleeve extension 8 is provided with an annular groove 10, into l which the snap ring 9 is adapted to expand. `The sleeve and the nut carried thereby are thus rotatably mounted on the end of the driving tube but they yare secured against endwise movement by means of the snapjring specified.

Loosely fitting the interior of the driving tube and adapted to be extended or retracted with relation thereto is a screw rod 1.1, on the lower end of which is formed a chuck 12 for the reception of a drill 18 or similar tool. The drill rod is provided with square threads on thev exterior surface, which engage the threads of the nut 7. The drill rod is otherwise provided `with a central passage 14: and its upperend is slotted, as at 15, for the reception of a -key orfdriving lug 16. The driving lug is suiiiciently long to project into the opposite slotsV 6 formed in the driving tube 3 and afpositive driving connection is thus formed between the driving tube and the screw rod 11. Attached'to the key or driving lug 16 is a rod 17. This rod extends downwardly through the central passage 1A and its lower end is rotatably secured in a cross bar 18 which is 'slidably mounted in a slot 19 formed just above the chuck 12.` spring 20 is interposed between the cross bar 18 and the upper end 20 of the axial recess in ywhich the spring and the driving tool; and secondly, that of breaking the driving connection between the same when the screw rod -is to-be retracted, as will hereinafter be described.

The operation of the drill extension will be as ollows: With the shank A secured in the chuck of al motor or other suitable driving member, it should be obvious that rotary movement will be transmitted through the driving tube to the screw rod and from the rod through the chuck 12 to the drill or other tool supported. l,

' "With the screw rod completely retracted, as shown in Fig. 1, if it is desired to extend the same, it will only be necessary for the operator to grasp the sleeve 8 carrying the nut 7. Securing the nut against rotary movement will cause the screw rod 11 to be extended. screw rod is slidably mountedl within the driving tube but'turns in unison with the same, due to the driving connection formed by the key 16, which projects into the slots 6. Rotation of the driving' tube and the screw rod with relation to the nut, when this is held stationary as described, will therefore cause a projection of the screw rod while a release of the nut 8 or the sleeve carrying the same will prevent further extension or elongation of the rod lwith'relation to the driving tube.

From the foregoing it can be seen that it is possible to quickly extendV the screw rod 11 with relation to the driving tube when it is in operation as it is only necessary to grasp the sleeve 8 and hold it stationary until thedrill or the screw rod supporting the same has been extended as rar as required. It it is desired to retract the drill and the screw rod supporting the same, or to telescope it with relation to the driving tube, it is only necessary to grasp the chuck 12 and pull the cross rod 18 in an upward direction. This should be done when the drill is stationary. Pulling ofthe cross rod Vin an upward direction will transmit a similar movement through the rod 17 to lift the key 16 out of the slot in the upper end of the screw rod. The'driving connection between -the screw rod and the driving tube is thus broken and the screw rod may thereforebe held stationary Rotary movement is then transmitted to the driving tube, and as thescrew rod is held stationary, it should be obvious that it will be-retracted, due to the Vfact that it is held stationary while the otherY parts are revolving. In this connection it will be observed that the snap ring 9 produces the required'friction to form a driving connection between the tubes 3 and land the nut 8, when the screw'rod is retracted. The cross rod is released the moment the screw rod has been suiiiciently retracted and the driving connection between the tube 3 and the screw rod will immediately be formed as the spring 19 will depress This is due to the fact that the the connecting parts, or in other words, draw the key 16v downwardly, thus forming the driving connection previously specified. The extension here shown may beextended by the rotary power of the driving member and it may similarly be retracted. It is substantial and simple in construction and may be amply lubricated as all the parts employed, with the exception of the sleeve and nut, are inclosed by. means of the exterior covering tube 4. Chance of waste, chips or dirt entering through the slots 6v is furthermore obviated.

Y The extension may also be retracted or extended by merely grasping the tube 4l and turningthe sleeve andY nut by hand in either direction but it should be obvious that power extension and retraction is preferable as vit can certainly be more quickly accomplished.

While several features of the present invention are more er less specific in construction, I wish Vit, understood that various changes may be resorted to within the scope of the appended claims; similarly, that the materialsl and' inish of the severalparts employed may be such as the experience and judgment of the manufacturer may dictate.

Having thus described my invention,

what l claim and desire to secure by Letters Patent is- 1. A drill extension comprising a pair ot telescopic members, one of which is threaded, means rictionally connected tothe other for engaging with the threads of the vfirst member, means 'for coupling the'members together, and means extending throughV the inner member for rendering the coupling means inoperative.

2. A drill extension comprising a pair of telescopic members, one or which is threaded, means rrictionally connected to' the other Jfor engaging with the threads of the first member, a coupling member arranged within the outer telescopic member for coupling the two telescopic membersv together and an uncoupling member extending axially through the inner telescopic member and operable to render said coupling member inoperative. l Y j 3; A drill extension comprising a pair or telescopic members, one of which isthreaded,

engaging with the threads of the first member, the outer member formed with4 a lengthi wise slot, the inner member formed with an axial bore and in its inner end with a slot registrable with the slot of said outer member, a key member movable into theregistering slots to couple the telescopic members toi i gether, and means operable through the axial bore to disengagethe key from one of the slots of said members. i

l. A drill extension comprising a pair of telescopic members, one o1 which is threaded, means rictionally connected to the other for engaging with the threads of the first member, the outer member formed with a lengthwise slot, the inner member formed with an axial bore and in its inner end with a slot registrable with the slot of said outer member, a key member movable into the registering slots to couple the telescopic members together, a rod slidable in the axial bore and carrying the key member on its inner end, and an actuating member rotatably connected to the opposite end of the rod and operable from the exterior of the telescopic member to slide the rod.

5. A drill extension comprising a driving shank, a driving tube secured thereto, a screw rod interior of the driving tube and adapted to telescope with relation thereto,- a pair of alined slots formed in the driving tube and extending approximately from end to end thereof, and a key member on the screw rod within the tube for extending into said slots to form a driving connection between the tube and the screw rod.

6. A drill extension comprising a driving shank, a driving tube secured thereto, a screw rod interior of the driving tube. and adapted to telescope with relation thereto, a pair of alined slots formed in the driving tube and extending approximately from end to end thereof, a key member on the screw rod extending into said slots to form a driving connection between the tube and the screw rod, and a nut rotatably mounted on the driving tube and engageable with the threads on the screw rod, said nut rotatable with the tube when the key is disconnected from the screw for retracting the latter within said tube.

7. A drill extension comprising a driving shank, a driving' tube secured thereto, a

screw rod interior of the driving tube and adapted to telescope with relation thereto, a pair of alined slots formed in the drivin tube and extending approximately from end to end thereof, a key member within the tube and on the screw rod extending into said slots to form a driving connection between the tube and the screw rod, a nut rotatably mounted onthe driving tube and engageable with the threads on the screw rod, means exterior of and below the tube for disengaging the key member from the screw, and a tool-supporting chuck on the lower end of the screw rod.

v 8. A drill extension comprising a driving shank, a driving tube secured thereto, a screw rod telescopic within the driving tube and having screw threaded engagement therewith, a pair of alined slots formed in the driving tube and extending approximately from end to end thereof, a key member slidably mounted in the screw rod and projecting into the slots in the driving tube to form a driving connection between the driving tube and the screw rod, and means for moving the key into and out of engagement with relation to the screw rod.

9. A drill extension comprising a driving shank, a driving tube Secured thereto, a screw rod within the driving tube and adapted to telescope with relation thereto, a pair of alined slots formed in the driving tube and extending approximately from end to end thereof, a key member slidably mounted in the screw rod and projecting into the slots in the driving tube to form a driving connection between the driving tube and the screw rod, means for moving the key into and out of engagement with relation to the screw rod, a nut supported by and rotatably mounted on the lower end of the driving tube and frictionally related thereto for rotating therewith, the threads of said nut engaging the threads of the screw rod, a cover tube exterior of the driving `tube and secured thereto, and a tool-suppoting chuck on the lower end of the screw ro In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

RINALDO DEL PORTO.

Witnesses DANIEL ROGERS, V Cms. O. SUNKLER. 

